Yeah, 19 is excessive.
However, I really wouldn’t want to see a hard limit on these. Rather, make the LOC tainted debuff from them depend on the number of nodes in the network. The more nodes, the higher the debuff and/or the longer it lasts.
Or, as others suggested, don’t put any in-game limit on them and let server moderation take care of it. Of course, there are problems with server moderation in general that need to be addressed eventually, but that’s a completely different topic.
That might be true, too. There’s a fresh discussion about that.